package com.avi.util;
/*
 * The author disclaims copyright to this source code. In place of
 * a legal notice, here is a blessing:
 * 
 * May you do good and not evil.
 * May you find forgiveness for yourself and forgive others.
 * May you share freely, never taking more than you give.
 *
 */

import org.hibernate.Hibernate;
import org.hibernate.dialect.Dialect;
import org.hibernate.dialect.function.SQLFunctionTemplate;
import org.hibernate.dialect.function.StandardSQLFunction;
import org.hibernate.dialect.function.VarArgsSQLFunction;

import java.sql.Types;

public class SQLiteDialect extends Dialect
{
    public SQLiteDialect()
    {
        super();
        registerColumnType( Types.BIT, "integer" );
        registerColumnType( Types.TINYINT, "tinyint" );
        registerColumnType( Types.SMALLINT, "smallint" );
        registerColumnType( Types.INTEGER, "integer" );
        registerColumnType( Types.BIGINT, "bigint" );
        registerColumnType( Types.FLOAT, "float" );
        registerColumnType( Types.REAL, "real" );
        registerColumnType( Types.DOUBLE, "double" );
        registerColumnType( Types.NUMERIC, "numeric" );
        registerColumnType( Types.DECIMAL, "decimal" );
        registerColumnType( Types.CHAR, "char" );
        registerColumnType( Types.VARCHAR, "varchar" );
        registerColumnType( Types.LONGVARCHAR, "longvarchar" );
        registerColumnType( Types.DATE, "date" );
        registerColumnType( Types.TIME, "time" );
        registerColumnType( Types.TIMESTAMP, "timestamp" );
        registerColumnType( Types.BINARY, "blob" );
        registerColumnType( Types.VARBINARY, "blob" );
        registerColumnType( Types.LONGVARBINARY, "blob" );
        // registerColumnType(Types.NULL, "null");
        registerColumnType( Types.BLOB, "blob" );
        registerColumnType( Types.CLOB, "clob" );
        registerColumnType( Types.BOOLEAN, "integer" );

        registerFunction( "concat", new VarArgsSQLFunction( Hibernate.STRING, "",
                "||", "" ) );
        registerFunction( "mod", new SQLFunctionTemplate( Hibernate.INTEGER,
                "?1 % ?2" ) );
        registerFunction( "substr", new StandardSQLFunction( "substr",
                Hibernate.STRING ) );
        registerFunction( "substring", new StandardSQLFunction( "substr",
                Hibernate.STRING ) );
    }

    public boolean supportsIdentityColumns()
    {
        return true;
    }

    /*
      public boolean supportsInsertSelectIdentity() {
      return true; // As specify in NHibernate dialect
      }
      */

    public boolean hasDataTypeInIdentityColumn()
    {
        return false; // As specify in NHibernate dialect
    }

    /*
      public String appendIdentitySelectToInsert(String insertString) {
      return new StringBuffer(insertString.length()+30). // As specify in NHibernate dialect
      append(insertString).
      append("; ").append(getIdentitySelectString()).
      toString();
      }
      */

    public String getIdentityColumnString()
    {
        // return "integer primary key autoincrement";
        return "integer";
    }

    public String getIdentitySelectString()
    {
        return "select last_insert_rowid()";
    }

    public boolean supportsLimit()
    {
        return true;
    }

    public String getLimitString( String query, boolean hasOffset )
    {
        return new StringBuffer( query.length() + 20 ).append( query ).append(
                hasOffset ? " limit ? offset ?" : " limit ?" ).toString();
    }

    public boolean supportsTemporaryTables()
    {
        return true;
    }

    public String getCreateTemporaryTableString()
    {
        return "create temporary table if not exists";
    }

    public boolean dropTemporaryTableAfterUse()
    {
        return false;
    }

    public boolean supportsCurrentTimestampSelection()
    {
        return true;
    }

    public boolean isCurrentTimestampSelectStringCallable()
    {
        return false;
    }

    public String getCurrentTimestampSelectString()
    {
        return "select current_timestamp";
    }

    public boolean supportsUnionAll()
    {
        return true;
    }

    public boolean hasAlterTable()
    {
        return false; // As specify in NHibernate dialect
    }

    public boolean dropConstraints()
    {
        return false;
    }

    public String getAddColumnString()
    {
        return "add column";
    }

    public String getForUpdateString()
    {
        return "";
    }

    public boolean supportsOuterJoinForUpdate()
    {
        return false;
    }

    public String getDropForeignKeyString()
    {
        throw new UnsupportedOperationException(
                "No drop foreign key syntax supported by SQLiteDialect" );
    }

    public String getAddForeignKeyConstraintString( String constraintName,
                                                    String[] foreignKey, String referencedTable, String[] primaryKey,
                                                    boolean referencesPrimaryKey )
    {
        throw new UnsupportedOperationException(
                "No add foreign key syntax supported by SQLiteDialect" );
    }

    public String getAddPrimaryKeyConstraintString( String constraintName )
    {
        throw new UnsupportedOperationException(
                "No add primary key syntax supported by SQLiteDialect" );
    }

    public boolean supportsIfExistsBeforeTableName()
    {
        return true;
    }

    public boolean supportsCascadeDelete()
    {
        return false;
    }
}